Apparatus and method of differential IQ frequency up-conversion
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 26, 2013
Grant Date -
Sep 27, 2012
app pub date -
Sep 13, 2011
filing date -
Apr 16, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A balanced transmitter up-converts I and Q baseband signals directly from baseband-to-RF. The up-conversion process is sufficiently linear that no IF processing is required, even in communications applications that have stringent requirements on spectral growth. In operation, the balanced modulator sub-harmonically samples the I and Q baseband signals in a balanced and differential manner, resulting in harmonically rich signal. The harmonically rich signal contains multiple harmonic images that repeat at multiples of the sampling frequency, where each harmonic contains necessary information to reconstruct the I and Q baseband signals. The differential sampling is performed according to control signals that are phase shifted with respect to each other. The control signals may have pulse widths (or apertures) that operate to improve energy transfer to a desired harmonic in the harmonically rich signal. A bandpass filter can then be utilized to select the desired harmonic of interest from the harmonically rich signal.
First Claim
Other Claims data not available
Family
International Classification(s)
- 2011 Application Filing Year
- H04L Class
- 12446 Applications Filed
- 10382 Patents Issued To-Date
- 83.42 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | May 26, 2025 |
